2. Newsprint: also known as white newspaper, the packaging form is also divided into reel and flat edition. The basis weight of newsprint is about 5 1g, which is mainly used for printing newspapers and periodicals.
3. Offset paper: referred to as offset paper for short, the quantitative is 60- 180g, which is divided into double-sided offset paper and single-sided offset paper. Among them, 70- 120g double-sided paper is the most widely used. There are three kinds of double-sided and single-sided offset paper: special number, 1 number and No.2.
4. coated paper: coated paper is made by coating a layer of coating liquid on the base paper and super calendering. The basis weight is 90-250g, which can be divided into double coated paper and single coated paper. There are three product numbers: special number, No.1 and No.2.
5. Book cover paper: the quantitative is 80- 120g, which is mainly used for book covers. Book cover paper has a variety of colors to meet the needs of printing different covers.
6, the classification of paper:
(1) is divided into handmade paper and machine-made paper according to the mode of production.
(2) According to the thickness and weight of paper, it is divided into paper and cardboard.
(3) According to the purpose, it can be divided into wrapping paper, printing paper, industrial paper, office paper, cultural paper, household paper and special paper.
Extended data:
Paper specifications:
1. Orthographic paper: 787×1092mm
Second, the number of openings (positive) size unit (mm)
1, fully open 78 1× 1086
2,2 quarts 530×760
362×78 1
4, 4, 390×543?
5,6 quarts 362×390
6,8 kai271× 390
7, 16+095× 27 1
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